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Castle later labeled the essential substance secreted by a normal stomach as intrinsic factor and the substance present in food as extrinsic factor. Subsequent studies showed that the intrinsic factor serves as an intestinal transport vehicle for the extrinsic factor (later identified as vitamin B12) (139)
The supernatant was used as the protein-bound fraction
It also goes by a number of other names, such as: stone breaker gale-of-the-wind seed-under-leaf quebra pedra shatter stone chance pierre The plant has thin, leaf-covered branches and can grow up to about 2 feet (61 cm) tall
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